I think the lighter colour on the leading edge of the vertical tail is just the reflection of the dawn/dusk sun in the glossy black paint. You can see the same reflections on the spinners and drop tanks. I agree the blue spot above the horizontal tail is PRU blue, but this is likely an extension of a PRU blue painted upper horizontal tail. I was just wondering if the upper rear fuselage between the wing and tail was painted black or PRU blue.